Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financial Assets
Cash and due from banks	$ 486,789	$ 595,383
Equity securities	13,091	12,320
Available-for-sale debt securities	2,102,123	2,194,329
Net held-to-maturity debt securities	1,179,684	1,199,527
Net loans	12,121,002	11,507,786
Loans held for sale	25,433	16,354
Accrued interest receivable	79,759	77,435
Financial Liabilities
Deposits	13,432,373	13,168,704
Federal Home Loan Bank borrowings	1,475,000	1,350,000
Other borrowings	105,757	105,893
Subordinated debt and junior subordinated debt	279,193	279,078
Accrued interest payable	15,393	11,121
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets
Cash and due from banks	486,789	595,383
Equity securities	13,091	12,320
Available-for-sale debt securities	49,103
Accrued interest receivable	79,759	77,435
Financial Liabilities
Deposits	12,044,435	11,937,002
Other borrowings	101,959	103,057
Accrued interest payable	15,393	11,121
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets
Available-for-sale debt securities	2,051,900	2,193,162
Net held-to-maturity debt securities	1,028,202	1,068,896
Loans held for sale	25,433	16,354
Other assets - interest rate derivatives	81,205	72,183
Financial Liabilities
Deposits	1,367,316	1,209,819
Federal Home Loan Bank borrowings	1,473,741	1,349,217
Subordinated debt and junior subordinated debt	228,588	240,898
Other liabilities - interest rate derivatives	81,308	73,083
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets
Available-for-sale debt securities	1,120	1,167
Net held-to-maturity debt securities	230	263
Net loans	11,636,263	11,134,250
Carrying Amount [Member]
Financial Assets
Cash and due from banks	486,789	595,383
Equity securities	13,091	12,320
Available-for-sale debt securities	2,102,123	2,194,329
Net held-to-maturity debt securities	1,179,521	1,199,335
Net loans	12,121,002	11,507,786
Loans held for sale	25,433	16,354
Other assets - interest rate derivatives	81,205	72,183
Accrued interest receivable	79,759	77,435
Financial Liabilities
Deposits	13,432,373	13,168,704
Federal Home Loan Bank borrowings	1,475,000	1,350,000
Other borrowings	105,757	105,893
Subordinated debt and junior subordinated debt	279,193	279,078
Other liabilities - interest rate derivatives	81,308	73,083
Accrued interest payable	15,393	11,121
Fair Value Estimate [Member]
Financial Assets
Cash and due from banks	486,789	595,383
Equity securities	13,091	12,320
Available-for-sale debt securities	2,102,123	2,194,329
Net held-to-maturity debt securities	1,028,432	1,069,159
Net loans	11,636,263	11,134,250
Loans held for sale	25,433	16,354
Other assets - interest rate derivatives	81,205	72,183
Accrued interest receivable	79,759	77,435
Financial Liabilities
Deposits	13,411,751	13,146,821
Federal Home Loan Bank borrowings	1,473,741	1,349,217
Other borrowings	101,959	103,057
Subordinated debt and junior subordinated debt	228,588	240,898
Other liabilities - interest rate derivatives	81,308	73,083
Accrued interest payable	$ 15,393	$ 11,121